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Imagine a credit card true to form: swipe it and it changes
your account balance to a credit. $842 becomes -$842. Ought
to be as simple as a couple lines of code.
||If this is an idea where one can pay one's credit-card bill at a shop (and the merchanter gets a credit service-fee instead of a debit), then that's a wonderful idea.
||What if you accidentally swipe twice?